Pub Date : 2025-12-11DOI: 10.1016/j.optcom.2025.132769
Jian-Dong Zhang, Ben Wang, Kai-Min Zheng, Lijian Zhang
Illumination is an active technology that utilizes laser to obtain information, such as distance, velocity and morphology, about a target within the region of interest. As a preliminary task, one needs to know whether a target exists or not. In this paper, this problem is addressed through the use of quantum hypothesis testing. We discuss the error probability limits with different prior probabilities and target reflectivities. The effects of phase fluctuation are also studied. Interestingly, for some values of reflectivity and prior probability, any detection is useless because direct decision based on prior probability is the optimal strategy. For practical purposes, the most common scenarios without prior knowledge and signal phase are considered. We propose and analyze the error probability and detection advantage of intensity detection, which is a nearly optimal strategy in many cases. Our findings quantify the detection advantages that can be obtained through one-shot detection test, which may contribute to the field of optical remote sensing.
{"title":"One-shot detection advantages of coherent-state illumination with high background noise","authors":"Jian-Dong Zhang, Ben Wang, Kai-Min Zheng, Lijian Zhang","doi":"10.1016/j.optcom.2025.132769","DOIUrl":"10.1016/j.optcom.2025.132769","url":null,"abstract":"<div><div>Illumination is an active technology that utilizes laser to obtain information, such as distance, velocity and morphology, about a target within the region of interest. As a preliminary task, one needs to know whether a target exists or not. In this paper, this problem is addressed through the use of quantum hypothesis testing. We discuss the error probability limits with different prior probabilities and target reflectivities. The effects of phase fluctuation are also studied. Interestingly, for some values of reflectivity and prior probability, any detection is useless because direct decision based on prior probability is the optimal strategy. For practical purposes, the most common scenarios without prior knowledge and signal phase are considered. We propose and analyze the error probability and detection advantage of intensity detection, which is a nearly optimal strategy in many cases. Our findings quantify the detection advantages that can be obtained through one-shot detection test, which may contribute to the field of optical remote sensing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132769"},"PeriodicalIF":2.5,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-10DOI: 10.1016/j.optcom.2025.132760
Weipeng Lin , Jiawei Zhang , Zhenyou Zou , Yibin Lin , Yuyan Peng , Weiquan Yang , Yongai Zhang , Tailiang Guo , Chaoxing Wu , Xiongtu Zhou
Polarization-tunable dielectric metasurface structural colors hold disruptive potential for applications in fields such as information storage and multi-channel display. However, the efficient and accurate design of high-quality, low-crosstalk metasurfaces remains a critical challenge. To address this issue, this study proposes a Variational AutoEncoders (VAE) enhanced Tandem Neural Network (VTNN) model capable of performing inverse design, mapping target dynamic polarization structural colors to corresponding metasurface geometric parameters. For validation purposes, a biomimetic metasurface structural color with a cross-orthogonal configuration aligned along the X polarization direction was tested, achieving a maximum color gamut coverage of 123.9 % Adobe RGB. The results show that the proposed VTNN model significantly improves design efficiency and accuracy, with a prediction accuracy of 98 % on the test dataset. This is a 3 % improvement over the traditional Tandem Neural Network (TNN). In addition, the structural color image obtained through reverse design is more similar to the target image.
{"title":"VAE enhanced Tandem Neural Network for reverse design of metasurface structural-colors with high efficiency and accuracy","authors":"Weipeng Lin , Jiawei Zhang , Zhenyou Zou , Yibin Lin , Yuyan Peng , Weiquan Yang , Yongai Zhang , Tailiang Guo , Chaoxing Wu , Xiongtu Zhou","doi":"10.1016/j.optcom.2025.132760","DOIUrl":"10.1016/j.optcom.2025.132760","url":null,"abstract":"<div><div>Polarization-tunable dielectric metasurface structural colors hold disruptive potential for applications in fields such as information storage and multi-channel display. However, the efficient and accurate design of high-quality, low-crosstalk metasurfaces remains a critical challenge. To address this issue, this study proposes a Variational AutoEncoders (VAE) enhanced Tandem Neural Network (VTNN) model capable of performing inverse design, mapping target dynamic polarization structural colors to corresponding metasurface geometric parameters. For validation purposes, a biomimetic metasurface structural color with a cross-orthogonal configuration aligned along the X polarization direction was tested, achieving a maximum color gamut coverage of 123.9 % Adobe RGB. The results show that the proposed VTNN model significantly improves design efficiency and accuracy, with a prediction accuracy of 98 % on the test dataset. This is a 3 % improvement over the traditional Tandem Neural Network (TNN). In addition, the structural color image obtained through reverse design is more similar to the target image.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132760"},"PeriodicalIF":2.5,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.optcom.2025.132751
Yaya Mao , Bo Liu , Jianxin Ren , Shuaidong Chen , Guoqing Chen , Xiangyu Wu , Rahat Ullah , Lilong Zhao , Ying Li , Zhipeng Qi
{"title":"Corrigendum to “A high-security FBMC/OQAM transmission system based on Polar code and diversity DNA joint coding encryption” [Opt. Commun. 596 (2025) 132449]","authors":"Yaya Mao , Bo Liu , Jianxin Ren , Shuaidong Chen , Guoqing Chen , Xiangyu Wu , Rahat Ullah , Lilong Zhao , Ying Li , Zhipeng Qi","doi":"10.1016/j.optcom.2025.132751","DOIUrl":"10.1016/j.optcom.2025.132751","url":null,"abstract":"","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132751"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.optcom.2025.132754
Artyom Movsisyan, Arsen Babajanyan
We present an all-dielectric anisotropic metasurface bandstop filter operating in the near-infrared, composed of X-shaped silicon metaelements on a calcium fluoride substrate. Parametric simulations were performed to analyze the influence of metaelement geometry, showing that the element height is the key parameter controlling resonance linewidth, while variations in width, length, and periodicity primarily shift the resonance positions. The metasurface supports two distinct resonances at approximately 1.3 μm and 1.5 μm, with quality factors exceeding 104 and several thousand, respectively. Under oblique incidence up to 40°, the second resonance shifts by only about 2 nm, and the device achieves a transmission efficiency of 65 %, demonstrating superior performance compared to isotropic counterparts. Field mapping confirms that the two resonances originate from distinct electric- and magnetic-dominated modes. Due to its sensitivity and according to the parametric analysis indicated in the work, it can be seen that resonances can be shifted along the spectrum and used in the desired range. A thorough analysis of the distribution of electric and magnetic fields is presented. Combining ultrahigh Q-factors, angular robustness, and tunability, the proposed metasurface shows strong potential for applications in near-infrared communication, sensing, and integrated photonic systems.
{"title":"Dual-resonant anisotropic all-dielectric near-infrared bandstop filter with enhanced spectral and angular stability","authors":"Artyom Movsisyan, Arsen Babajanyan","doi":"10.1016/j.optcom.2025.132754","DOIUrl":"10.1016/j.optcom.2025.132754","url":null,"abstract":"<div><div>We present an all-dielectric anisotropic metasurface bandstop filter operating in the near-infrared, composed of X-shaped silicon metaelements on a calcium fluoride substrate. Parametric simulations were performed to analyze the influence of metaelement geometry, showing that the element height is the key parameter controlling resonance linewidth, while variations in width, length, and periodicity primarily shift the resonance positions. The metasurface supports two distinct resonances at approximately 1.3 μm and 1.5 μm, with quality factors exceeding 10<sup>4</sup> and several thousand, respectively. Under oblique incidence up to 40°, the second resonance shifts by only about 2 nm, and the device achieves a transmission efficiency of 65 %, demonstrating superior performance compared to isotropic counterparts. Field mapping confirms that the two resonances originate from distinct electric- and magnetic-dominated modes. Due to its sensitivity and according to the parametric analysis indicated in the work, it can be seen that resonances can be shifted along the spectrum and used in the desired range. A thorough analysis of the distribution of electric and magnetic fields is presented. Combining ultrahigh <em>Q</em>-factors, angular robustness, and tunability, the proposed metasurface shows strong potential for applications in near-infrared communication, sensing, and integrated photonic systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132754"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145734395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.optcom.2025.132766
Zhuoao Wen , Xianzhu Liu , Huiling Wu , Yuanzhu Zhou , Yuqi Sun , Yuezhang Hou , Xinjian Pan , Tianshu Wang
We successfully constructed a Mamyshev oscillator based on large-mode-area ytterbium-doped gain fiber, utilizing pairs of transmission gratings to form two filtering arms. Starting operation was achieved by injecting a "figure-9″ mode-locked laser seed. The nonlinear multi-pulse dynamics within the oscillator were systematically studied under different pump powers and polarization states. Various bound-state solitons (including dual- and triple-pulse bound states) and harmonic mode-locking phenomena were observed. Numerical simulations using the nonlinear Schrödinger equation were employed to analyze the pulse evolution process, and the results showed good agreement with the experimental observations. The highest output achieved was the eighth harmonic at a repetition rate of 89.28 MHz with an average output power of 839.4 mW. This confirms the strong potential of the Mamyshev oscillator in generating high-energy femtosecond pulses and rich multi-pulse states.
{"title":"A Yb-doped fiber Mamyshev oscillator with bound-state pulse and harmonic mode-locking","authors":"Zhuoao Wen , Xianzhu Liu , Huiling Wu , Yuanzhu Zhou , Yuqi Sun , Yuezhang Hou , Xinjian Pan , Tianshu Wang","doi":"10.1016/j.optcom.2025.132766","DOIUrl":"10.1016/j.optcom.2025.132766","url":null,"abstract":"<div><div>We successfully constructed a Mamyshev oscillator based on large-mode-area ytterbium-doped gain fiber, utilizing pairs of transmission gratings to form two filtering arms. Starting operation was achieved by injecting a \"figure-9″ mode-locked laser seed. The nonlinear multi-pulse dynamics within the oscillator were systematically studied under different pump powers and polarization states. Various bound-state solitons (including dual- and triple-pulse bound states) and harmonic mode-locking phenomena were observed. Numerical simulations using the nonlinear Schrödinger equation were employed to analyze the pulse evolution process, and the results showed good agreement with the experimental observations. The highest output achieved was the eighth harmonic at a repetition rate of 89.28 MHz with an average output power of 839.4 mW. This confirms the strong potential of the Mamyshev oscillator in generating high-energy femtosecond pulses and rich multi-pulse states.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132766"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.optcom.2025.132762
Doudou Wang , Jinhua Hu , Xiuhong Liu
Bound states in the continuum (BICs) have attracted considerable interest as a means to enhance light-matter interactions in optical sensing, by supporting ultra-high quality (Q) factor resonances and pronounced local field confinement. In this work, we propose a distributed Bragg reflector-metagrating-DBR (DBR-metagrating-DBR) vertical cavity structure that utilizes bound states in the continuum (BICs) to enhance surface sensing while maintaining a robust Q-factor. Here, the proposed structure enables multi-band sensing by simultaneously supporting three resonance modes: symmetry-protected bound states in the continuum (SP-BICs) generated by symmetry breaking in the grating width, Brillouin zone-folded BICs (BZF-BICs) induced by periodic perturbations, and Fabry-Pérot (F-P) resonances formed through constructive interference. Interestingly, these two distinct BIC modulation mechanisms enable flexible tunability of the structural Q-factor while maintaining its robustness. Simulation results indicate that this structure exhibits excellent dual-mode detection performance. The F-P resonance mode achieves a bulk refractive index sensitivity of 720 nm/RIU and a figure of merit of 1230.77. In contrast, the BZF-BICs provides a surface refractive index sensitivity of 69.51 nm/RIU and a figure of merit of 8821.07. This indicates a significant advancement in the field of surface molecular layer detection and provides a promising strategy for the future development of multifunctional optical biosensors.
连续介质中的束缚态（bic）作为光学传感中增强光-物质相互作用的一种手段，通过支持超高质量(Q)因子共振和明显的局部场约束，引起了相当大的兴趣。在这项工作中，我们提出了一种分布式Bragg反射器-偏磁- dbr （dbr -偏磁- dbr）垂直腔结构，该结构利用连续体（bic）中的结合态来增强表面传感，同时保持稳健的q因子。在这里，所提出的结构通过同时支持三种共振模式来实现多波段传感：由光栅宽度的对称破缺产生的连续介质中的对称保护束缚态（SP-BICs），由周期性扰动引起的布里渊区折叠BICs (BZF-BICs)，以及通过建设性干涉形成的法布里- p (F-P)共振。有趣的是，这两种不同的BIC调制机制使结构q因子具有灵活的可调性，同时保持其稳健性。仿真结果表明，该结构具有良好的双模检测性能。F-P共振模式的体折射率灵敏度为720 nm/RIU，品质系数为1230.77。相比之下，BZF-BICs的表面折射率灵敏度为69.51 nm/RIU，品质值为8821.07。这标志着表面分子层检测领域的重大进展，为多功能光学生物传感器的未来发展提供了一个有希望的策略。
{"title":"Surface-sensing enhancement via bound states in the continuum in metagrating-based vertical cavities with robust Q-factor","authors":"Doudou Wang , Jinhua Hu , Xiuhong Liu","doi":"10.1016/j.optcom.2025.132762","DOIUrl":"10.1016/j.optcom.2025.132762","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) have attracted considerable interest as a means to enhance light-matter interactions in optical sensing, by supporting ultra-high quality (<em>Q</em>) factor resonances and pronounced local field confinement. In this work, we propose a distributed Bragg reflector-metagrating-DBR (DBR-metagrating-DBR) vertical cavity structure that utilizes bound states in the continuum (BICs) to enhance surface sensing while maintaining a robust <em>Q</em>-factor. Here, the proposed structure enables multi-band sensing by simultaneously supporting three resonance modes: symmetry-protected bound states in the continuum (SP-BICs) generated by symmetry breaking in the grating width, Brillouin zone-folded BICs (BZF-BICs) induced by periodic perturbations, and Fabry-Pérot (F-P) resonances formed through constructive interference. Interestingly, these two distinct BIC modulation mechanisms enable flexible tunability of the structural <em>Q</em>-factor while maintaining its robustness. Simulation results indicate that this structure exhibits excellent dual-mode detection performance. The F-P resonance mode achieves a bulk refractive index sensitivity of 720 nm/RIU and a figure of merit of 1230.77. In contrast, the BZF-BICs provides a surface refractive index sensitivity of 69.51 nm/RIU and a figure of merit of 8821.07. This indicates a significant advancement in the field of surface molecular layer detection and provides a promising strategy for the future development of multifunctional optical biosensors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132762"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.optcom.2025.132759
Silun Du , Baoqun Li , Yunhan Deng , Yibing Chen , Yuxia Song , Tianshu Wang , Gang Deng
Femtosecond fiber lasers operating in the 2 μm region have attracted considerable attention owing to their eye-safe wavelength, broad gain bandwidth, and promising applications in optical communication, biomedical imaging, and material processing. However, the intrinsic large anomalous dispersion of silica fibers at 2 μm makes it challenging to realize short-cavity dissipative soliton operation in an all-fiber configuration. We demonstrate a dispersion-managed all-fiber short-cavity mode-locked laser enabled by extended-tapered micro-nano fibers (MNFs). The MNFs provide strong positive waveguide dispersion and low insertion loss, enabling large dispersion compensation with negligible cavity-length penalty, which makes them particularly suitable for short-cavity fiber lasers. Stable dissipative soliton pulses were achieved with a 3 dB spectral bandwidth exceeding 50 nm, a pulse duration of 277 fs, and a fundamental repetition rate of 102.3 MHz. The measured radio-frequency spectrum exhibits a signal-to-noise ratio (SNR) above 46 dB, and a 1-h stability test confirmed power fluctuations as low as 0.113 %. This work highlights the unique dispersion compensation capability of tapered MNFs and their potential for compact, high-repetition-rate, and integrable ultrafast fiber laser platforms. The results also suggest broad application prospects of 2 μm dissipative soliton fiber lasers in fields such as mid-infrared frequency comb generation, precision spectroscopy, high-speed optical communication, biomedical diagnostics, and advanced material processing.
{"title":"2 μm all-fiber dispersion-managed laser enabling dissipative soliton with long tapered MNFs","authors":"Silun Du , Baoqun Li , Yunhan Deng , Yibing Chen , Yuxia Song , Tianshu Wang , Gang Deng","doi":"10.1016/j.optcom.2025.132759","DOIUrl":"10.1016/j.optcom.2025.132759","url":null,"abstract":"<div><div>Femtosecond fiber lasers operating in the 2 μm region have attracted considerable attention owing to their eye-safe wavelength, broad gain bandwidth, and promising applications in optical communication, biomedical imaging, and material processing. However, the intrinsic large anomalous dispersion of silica fibers at 2 μm makes it challenging to realize short-cavity dissipative soliton operation in an all-fiber configuration. We demonstrate a dispersion-managed all-fiber short-cavity mode-locked laser enabled by extended-tapered micro-nano fibers (MNFs). The MNFs provide strong positive waveguide dispersion and low insertion loss, enabling large dispersion compensation with negligible cavity-length penalty, which makes them particularly suitable for short-cavity fiber lasers. Stable dissipative soliton pulses were achieved with a 3 dB spectral bandwidth exceeding 50 nm, a pulse duration of 277 fs, and a fundamental repetition rate of 102.3 MHz. The measured radio-frequency spectrum exhibits a signal-to-noise ratio (SNR) above 46 dB, and a 1-h stability test confirmed power fluctuations as low as 0.113 %. This work highlights the unique dispersion compensation capability of tapered MNFs and their potential for compact, high-repetition-rate, and integrable ultrafast fiber laser platforms. The results also suggest broad application prospects of 2 μm dissipative soliton fiber lasers in fields such as mid-infrared frequency comb generation, precision spectroscopy, high-speed optical communication, biomedical diagnostics, and advanced material processing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132759"},"PeriodicalIF":2.5,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Organic solid-state lasers are indeed a promising class of photonic devices with significant potential in optoelectronics, laser communication, sensor, and information security technologies. However, because of the lack of gain materials with efficient emission efficiency and excellent optical stability, the further development of organic solid-state lasers faces some difficulties. Here, a structurally simple organic molecules 2,5-bis(alkylamino)terephthalates derivatives (BAT) is introduced that include a very little -conjugated system (only one benzene ring). The BAT organic single-crystalline microribbons fabricated by a facile solution-based self-assembly method can serve as Fabry-Pérot (F-P) resonators, whose laser emission wavelength is around ∼628 nm. Moreover, both multi-mode and single-mode lasing emissions are successfully demonstrated in different organic microribbons, achieving a low threshold of 78 2. The quality factor Q can reach 3925. These as-prepared BAT organic single-crystalline microribbons can provide potential application as high performance and low threshold solid-state microlasers for optoelectronic devices.
{"title":"High-quality Fabry-Pérot mode microlaser based on self-assembled organic single-crystalline microribbons","authors":"Hui Zhang , Li-Xia Zhao , Meng-Dan Qian , Yu-Fang Liu","doi":"10.1016/j.optcom.2025.132761","DOIUrl":"10.1016/j.optcom.2025.132761","url":null,"abstract":"<div><div>Organic solid-state lasers are indeed a promising class of photonic devices with significant potential in optoelectronics, laser communication, sensor, and information security technologies. However, because of the lack of gain materials with efficient emission efficiency and excellent optical stability, the further development of organic solid-state lasers faces some difficulties. Here, a structurally simple organic molecules 2,5-bis(alkylamino)terephthalates derivatives (BAT) is introduced that include a very little <span><math><mrow><mi>π</mi></mrow></math></span>-conjugated system (only one benzene ring). The BAT organic single-crystalline microribbons fabricated by a facile solution-based self-assembly method can serve as Fabry-Pérot (F-P) resonators, whose laser emission wavelength is around ∼628 nm. Moreover, both multi-mode and single-mode lasing emissions are successfully demonstrated in different organic microribbons, achieving a low threshold of 78 <span><math><mrow><mi>μ</mi><mi>J</mi><mo>/</mo><mtext>cm</mtext></mrow></math></span><sup>2</sup>. The quality factor Q can reach 3925. These as-prepared BAT organic single-crystalline microribbons can provide potential application as high performance and low threshold solid-state microlasers for optoelectronic devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132761"},"PeriodicalIF":2.5,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Indoor multipath effects, noise, and other impairments introduce errors in channel state information (CSI), significantly limiting the accuracy and stability of visible light positioning (VLP) methods based on trilateration. To address this challenge, we propose a bias-aided denoising network for VLP: Bias-Aided Denoising LSTM (BD-LSTM). The key idea is to integrate machine learning with CSI-based ranging, thereby compensating for distance estimation errors and improving localization precision. Specifically, the network takes channel impulse response (CIR) measurements as input and predicts optimal bias values using a pre-trained database of bias labels, which are then applied to refine CSI estimation. During positioning, the bias-corrected CIR is utilized for ranging, effectively mitigating distortions induced by multipath and noise. Simulation results in an indoor multipath scenario of 4 m × 4 m × 3 m demonstrate that BD-LSTM achieves a mean error of 1.22 cm and a root mean square error (RMSE) of 1.56 cm. When benchmarked against CSI-based LS, BiLSTM, GRU, and PCA-LSTM, the proposed scheme reduces the mean error by up to 75 % and the RMSE by up to 71 %, demonstrating superior localization accuracy and robustness.
室内多径效应、噪声和其他缺陷会导致信道状态信息（CSI）的误差，极大地限制了基于三边测量的可见光定位（VLP）方法的准确性和稳定性。为了解决这一挑战，我们提出了一种用于VLP的偏差辅助去噪网络：偏差辅助去噪LSTM （BD-LSTM）。关键思想是将机器学习与基于csi的测距相结合，从而补偿距离估计误差，提高定位精度。具体来说，该网络将信道脉冲响应（CIR）测量值作为输入，并使用预训练的偏差标签数据库预测最佳偏差值，然后将其应用于改进CSI估计。在定位过程中，利用偏置校正后的CIR进行测距，有效地减轻了多径和噪声引起的畸变。在4 m × 4 m × 3 m室内多径场景下的仿真结果表明，BD-LSTM的平均误差为1.22 cm，均方根误差（RMSE）为1.56 cm。当与基于csi的LS、BiLSTM、GRU和PCA-LSTM进行基准测试时，所提出的方案将平均误差降低了75%，RMSE降低了71%，证明了优越的定位精度和鲁棒性。
{"title":"Adaptive bias-aided CIR denoising for visible light positioning with LSTM-based network","authors":"Kaiyao Wang, Zhengwei Jiang, Linyuan Guo, Zhiyong Hong, Qian Yin","doi":"10.1016/j.optcom.2025.132757","DOIUrl":"10.1016/j.optcom.2025.132757","url":null,"abstract":"<div><div>Indoor multipath effects, noise, and other impairments introduce errors in channel state information (CSI), significantly limiting the accuracy and stability of visible light positioning (VLP) methods based on trilateration. To address this challenge, we propose a bias-aided denoising network for VLP: Bias-Aided Denoising LSTM (BD-LSTM). The key idea is to integrate machine learning with CSI-based ranging, thereby compensating for distance estimation errors and improving localization precision. Specifically, the network takes channel impulse response (CIR) measurements as input and predicts optimal bias values using a pre-trained database of bias labels, which are then applied to refine CSI estimation. During positioning, the bias-corrected CIR is utilized for ranging, effectively mitigating distortions induced by multipath and noise. Simulation results in an indoor multipath scenario of 4 m × 4 m × 3 m demonstrate that BD-LSTM achieves a mean error of 1.22 cm and a root mean square error (RMSE) of 1.56 cm. When benchmarked against CSI-based LS, BiLSTM, GRU, and PCA-LSTM, the proposed scheme reduces the mean error by up to 75 % and the RMSE by up to 71 %, demonstrating superior localization accuracy and robustness.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132757"},"PeriodicalIF":2.5,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.optcom.2025.132758
Jinliang Han , Xiaonan Shan , Yawei Zhang , Hangyu Peng , Jiye Zhang , Jun Zhang , Lijun Wang
In this study, we developed a new cascaded external cavity feedback structure based on volume Bragg gratings to narrow the linewidth and lock the central wavelength of a laser diode array (LDA). Leveraging the beam-shaping and cascaded external cavity feedback technologies, the self-excitation effect of multiple diode laser emitters caused by the smile effect was effectively avoided. The performance of the developed structure was experimentally evaluated. An LDA with a central wavelength of 779.932 nm, spectral linewidth of 0.156 nm, side-mode suppression ratio (SMSR) of 22.57 dB, and output power of 49.6 W was achieved at an operating current of 60 A. According to the experimental results, the cascaded external cavity feedback structure effectively ensured a narrow linewidth and improved the SMSR. This new structure is scalable, and the laser power can be further increased by coupling a larger number of LDAs and combining them with incoherent beam technology. This structure provides a feasible scheme for scaling the output power and narrowing the linewidth of diode lasers.
{"title":"Cascaded external cavity feedback structure for self-excitation effect suppression in multiple diode laser emitters","authors":"Jinliang Han , Xiaonan Shan , Yawei Zhang , Hangyu Peng , Jiye Zhang , Jun Zhang , Lijun Wang","doi":"10.1016/j.optcom.2025.132758","DOIUrl":"10.1016/j.optcom.2025.132758","url":null,"abstract":"<div><div>In this study, we developed a new cascaded external cavity feedback structure based on volume Bragg gratings to narrow the linewidth and lock the central wavelength of a laser diode array (LDA). Leveraging the beam-shaping and cascaded external cavity feedback technologies, the self-excitation effect of multiple diode laser emitters caused by the smile effect was effectively avoided. The performance of the developed structure was experimentally evaluated. An LDA with a central wavelength of 779.932 nm, spectral linewidth of 0.156 nm, side-mode suppression ratio (SMSR) of 22.57 dB, and output power of 49.6 W was achieved at an operating current of 60 A. According to the experimental results, the cascaded external cavity feedback structure effectively ensured a narrow linewidth and improved the SMSR. This new structure is scalable, and the laser power can be further increased by coupling a larger number of LDAs and combining them with incoherent beam technology. This structure provides a feasible scheme for scaling the output power and narrowing the linewidth of diode lasers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"601 ","pages":"Article 132758"},"PeriodicalIF":2.5,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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